Question 1

This illustration shows a ________ type of combustion chamber.

Accepted Answer

A)   wall-guided
B)   tumble-guided
C)   spray-guided
D)   swirl-guidedE) A) and B)
F) A) and C)

Question 2

All of the following are disadvantages of gasoline direct injection EXCEPT ________.

Accepted Answer

A)   more components compared to port fuel injection
B)   less need for extra fuel for acceleration
C)   higher cost
D)   NOx storage catalyst may be neededE) All of the above
F) A) and D)

Question 3

When compared to a port fuel injected engine, a GDI engine will have a(n)  ________ compression ratio.

Accepted Answer

A)   reversed
B)   interrupted
C)   lower
D)   higherE) B) and D)
F) B) and C)

Question 4

Which component of this GDI high pressure pump is the pressure regulator?

Accepted Answer

A)   A
B)   B
C)   C
D)   DE) None of the above
F) B) and C)

Question 5

The fuel injectors used on a gasoline direct injection system are pulsed ON using what voltage?

Accepted Answer

A)   100 to 110 V
B)   12 to 14 V
C)   200 to 220 V
D)   50 to 90 VE) None of the above
F) C) and D)

Question 6

Some engines that use a GDI system have carbon issues ________.

Accepted Answer

A)   on the fuel injectors
B)   on the intake valves
C)   on the exhaust valves
D)   Both A and CE) A) and D)
F) A) and B) D

Question 7

A GDI system operating in stratified mode results in ________.

Accepted Answer

A)   the air-fuel mixture being evenly distributed in the combustion chamber
B)   black smoke from the exhaust
C)   a rich air-fuel mixture near the spark plug tip
D)   None of theseE) A) and D)
F) B) and C)

Question 8

Gasoline direct injection (GDI)  is also known as ________.

Accepted Answer

A)   EFI
B)   DI
C)   UIDI
D)   SIDIE) A) and B)
F) C) and D)

Question 9

The high-pressure fuel pressure is regulated by using ________.

Accepted Answer

A)   a vacuum-biased regulator
B)   an electric pressure control valve
C)   a non-vacuum-biased regulator
D)   a mechanical regulator at the inlet to the fuel railE) B) and C)
F) A) and D)

Question 10

All of the following are advantages of gasoline direct injection EXCEPT ________.

Accepted Answer

A)   improved fuel economy
B)   decreased throttle response
C)   able to use lower-octane gasoline
D)   higher engine efficiencyE) B) and C)
F) None of the above

Question 11

Which mode of operation results in a richer air-fuel mixture near the spark plug?

Accepted Answer

A)   Stoichiometric
B)   Homogeneous
C)   Knock protection
D)   StratifiedE) A) and D)
F) A) and B)

Question 12

When the fuel pressure regulator is deactivated, the fuel pressure defaults to ________.

Accepted Answer

A)   high pressure mode
B)   60 PSI
C)   low pressure mode
D)   acceleration modeE) A) and B)
F) A) and C)

Question 13

The SIDI high pressure fuel pump uses a single-barrel piston plunger that is driven by a(n)  ________.

Accepted Answer

A)   three-lobed cam
B)   electric motor
C)   single flat sided cam
D)   square-lobed camE) B) and D)
F) A) and C) A

Question 14

The high-pressure fuel pumps used in gasoline direct injection (GDI)  systems are powered by ________.

Accepted Answer

A)   electricity (DC motor) 
B)   the crankshaft
C)   the camshaft
D)   electricity (AC motor) E) A) and B)
F) A) and C)

Question 15

Where is the fuel injected in an engine equipped with gasoline direct injection?

Accepted Answer

A)   Directly into the combustion chamber
B)   Into the intake manifold near the intake valve
C)   Above the intake port
D)   In the exhaust portE) C) and D)
F) A) and C)

Question 16

GDI equipped engines have a higher efficiency due to a ________ compression ratio.

Accepted Answer

A)   higher
B)   colder
C)   related
D)   lowerE) B) and D)
F) All of the above

Question 17

Why should any high-pressure line removed be replaced with a new part on a GDI system?

Accepted Answer

A)   The ball-ends deform when tightened and will not seal if reused
B)   The torque needed to remove the lines causes the lines to be damaged
C)   The high-pressure lines are part of the high-pressure pump and must be replaced as an assembly
D)   All of the aboveE) A) and B)
F) B) and C)

Question 18

What GDI operating mode is used to burn sulfur from the NOx catalyst?

Accepted Answer

A)   Stratified heating mode
B)   Homogeneous stratified mode
C)   Stratified mode
D)   None of theseE) A) and C)
F) B) and D)

Question 19

GDI fuel injectors operate under a pressure of about ________.

Accepted Answer

A)   500 to 2,900 PSI
B)   2,000 to 5,000 PSI
C)   90 to 150 PSI
D)   35 to 45 PSIE) B) and D)
F) C) and D)

Question 20

An engine equipped with GDI may have up to a ________ percent improvement in fuel economy.

Accepted Answer

A)   25
B)   6
C)   50
D)   10E) A) and D)
F) A) and C) A

Exam 23: Gasoline Direct-Injection Systems

This illustration shows a ________ type of combustion chamber.

Correct AnswerverifiedShow Answer

All of the following are disadvantages of gasoline direct injection EXCEPT ________.

Correct AnswerverifiedShow Answer

When compared to a port fuel injected engine, a GDI engine will have a(n) ________ compression ratio.

Correct AnswerverifiedShow Answer

Which component of this GDI high pressure pump is the pressure regulator?

Correct AnswerverifiedShow Answer

The fuel injectors used on a gasoline direct injection system are pulsed ON using what voltage?

Correct AnswerverifiedShow Answer

Some engines that use a GDI system have carbon issues ________.

Correct AnswerverifiedD

A GDI system operating in stratified mode results in ________.

Correct AnswerverifiedShow Answer

Gasoline direct injection (GDI) is also known as ________.

Correct AnswerverifiedShow Answer

The high-pressure fuel pressure is regulated by using ________.

Correct AnswerverifiedShow Answer

All of the following are advantages of gasoline direct injection EXCEPT ________.

Correct AnswerverifiedShow Answer

Which mode of operation results in a richer air-fuel mixture near the spark plug?

Correct AnswerverifiedShow Answer

When the fuel pressure regulator is deactivated, the fuel pressure defaults to ________.

Correct AnswerverifiedShow Answer

The SIDI high pressure fuel pump uses a single-barrel piston plunger that is driven by a(n) ________.

Correct AnswerverifiedA

The high-pressure fuel pumps used in gasoline direct injection (GDI) systems are powered by ________.

Correct AnswerverifiedShow Answer

Where is the fuel injected in an engine equipped with gasoline direct injection?

Correct AnswerverifiedShow Answer

GDI equipped engines have a higher efficiency due to a ________ compression ratio.

Correct AnswerverifiedShow Answer

Why should any high-pressure line removed be replaced with a new part on a GDI system?

Correct AnswerverifiedShow Answer

What GDI operating mode is used to burn sulfur from the NOx catalyst?

Correct AnswerverifiedShow Answer

GDI fuel injectors operate under a pressure of about ________.

Correct AnswerverifiedShow Answer

An engine equipped with GDI may have up to a ________ percent improvement in fuel economy.

Correct AnswerverifiedA

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What GDI operating mode is used to burn sulfur from the NO_xcatalyst?

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